On Tuesday in Nome, Alaska, the temperature started at −6ºC and reached a high of 3ºC. By how much did the temperature rise throughout the day?

To find the amount by which the temperature rose throughout the day, subtract the starting temperature from the highest temperature: 3ºC - (-6ºC) = 3ºC + 6ºC = <<3+6=9>>9ºC. Answer: \boxed{9}.

To find the temperature rise throughout the day in Nome, Alaska, we need to subtract the starting temperature from the highest temperature reached.

The starting temperature is −6ºC and the highest temperature is 3ºC.

To calculate the temperature rise, we subtract the starting temperature from the highest temperature:
3ºC - (-6ºC)
= 3ºC + 6ºC
= 9ºC

Therefore, the temperature rose by 9ºC throughout the day in Nome, Alaska.

To find out how much the temperature rose throughout the day in Nome, Alaska, we need to subtract the starting temperature from the highest temperature reached.

The starting temperature is given as -6ºC and the highest temperature reached is 3ºC.

To find the difference, we subtract the starting temperature from the highest temperature:

3ºC - (-6ºC)

First, we can simplify the subtraction of negative numbers by changing the double negative into a positive:

3ºC + 6ºC

Now, we can add the temperatures together:

3ºC + 6ºC = 9ºC

Therefore, the temperature rose by 9 degrees Celsius throughout the day in Nome, Alaska.